package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.data.redis.core.StringRedisTemplate;

import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private static final String key_prefix = "lock:";
    private static final String id_prefix = UUID.randomUUID().toString() + "-";

    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识
        String threadId = id_prefix + Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(key_prefix + name, threadId , timeoutSec, TimeUnit.SECONDS);

        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
        //获取线程标示
        String threadId = id_prefix + Thread.currentThread().getId();
        //获取锁中的标识
        String id = stringRedisTemplate.opsForValue().get(key_prefix + name);
        //判断标示是否一致
        if(threadId.equals(id)) {
            //释放锁
            stringRedisTemplate.delete(key_prefix + name);
        }
    }
}
